Yeah, mine have that substructure-available-on-zoom too. It seems pretty clear that our brains are doing the same thing here. Out of curiosity, do you feel that you read more quickly or more slowly than others? I'm a very slow reader -- my silent reading speed is about on par with my reading-aloud speed, and I've sometimes wondered if this is connected at all to my tendency to visualize things, or is completely unrelated.

On the other hand, I think having a detailed timeline helps me to remember when events took place. I've noticed on movie rounds at pub trivia that I'm often able to make more use than some of my teammates of the year a movie was released, if that information was given, to rule out possible answers -- not because I know the exact dates of when many movies came out, but because if I'm familiar with the film at all, then I have a general sense of where it should go on my timeline. (Disclaimer: it's quite possible that this is all just confirmation bias on my part.)